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VPD is one of the best ways to push data security down to the lowest possible level It s easy to envision scenarios in which all the data security was built into the application layer When another technology is introduced that needs to access the same data, the semantics of the security policy has to be replicated to the new technology Obviously, this is difficult to maintain, prone to errors, and easy to subvert, because all a nefarious individual has to do to access the data is connect directly to the database, effectively bypassing the security VPD is a critically important solution to protect the data at the source The classic VPD use case is to set one or more session context variables when an end user logs into an application, and then use those context variables in a VPD policy that determines the rows to which a user has access This is a fairly straightforward task in client-server environments, where the database session of an end user persists as long as the user is logged into the application As discussed in 11, APEX database sessions persist only as long as it takes to process a page request, which is typically less than a second This is yet another area where the difference between nonpersistent and persistent sessions causes a lot of confusion for developers Fortunately, you an integrate VPD with APEX in many ways One option is to use the Virtual Private Database attribute of an APEX application to call a procedure that sets session context variables This technique works particularly well with legacy VPD applications that are already using session context variables Another option is to reference APEX items in the VPD policy, which we will refer to as an item-based policy A third option is to use Oracle Database Global Application Context variables, which were specifically designed for use with stateless applications Global Application Contexts have a significant drawback in that they offer no built-in way to purge expired sessions As such, they are not a good solution for APEX and VPD, and are not covered in this book.

The McGraw Hill Companies, 2010

The easiest approach to implement is to use APEX items As you might expect, this approach has both advantages and disadvantages Following are the advantages of using APEX items: APEX items are persistent for the life of the end user s APEX session If you set the value of an item when a user logs into the application, that value will still be there as long as the user is using the application Because the items are persistent, their values need to be set only once for example, when a user authenticates This is especially beneficial if the code used to determine a user s authorization rights is expensive The syntax used to set an APEX item is exceptionally easy APEX items are purged at regular intervals so a developer doesn t need to worry about cleanup procedures

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Create the front and right-side views of the tting Then construct the auxiliary view Dimension the front and right-side views

An object is dropped from the roof of a 60-foot building How long must it fall to reach a height of 28 feet In the formula h 16t2 v0 t h0 , h0 is 60 and v0 is zero (because the object is dropped) The object reaches a height of 28 feet when h 28

The McGraw Hill Companies, 2010

The disadvantage of using APEX items is that APEX items can be used only with APEX applications If the VPD policy is to be used in a heterogeneous environment, it will need separate logic for APEX and any other technology that needs to access the data

Create the front and right-side views of the block Then construct the auxiliary view Dimension the front and right-side views

12:

h 16t2 60 28 16t2 60 16t2 32 t2 32 16 p t 2 is not a solution)

The McGraw Hill Companies, 2010

In the following example, we will create a simple table to store users and their roles When a user logs into our APEX application, we will store the role in an APEX item We will then reference the value of this APEX item in a function used for a VPD policy If the user s role is ADMINISTRATOR, he will see all rows in the table If his role is READ, he will see only his own row All others, such as a user that access this table from a reporting tool, will not see any rows

Create the front and right-side views of the casting The right-side view should include a half section Fully dimension both views

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SYS@AOS> grant create any context to sec_admin; SYS@AOS> grant execute on sysdbms_rls to sec_admin; -- Execute the following DDL as schema SEC_ADMIN create table sec_adminuser_app_roles( id char(32), user_name varchar2(255), role_name varchar2(255), constraint user_app_roles_pk primary key (id), constraint user_app_roles_uq unique(user_name,role_name), constraint user_app_roles_ck check (role_name in ('ADMINISTRATOR', 'READER')) ) / create or replace trigger bi_user_app_roles before insert on user_app_roles for each row begin :newid := sys_guid(); :newuser_name := upper(:newuser_name); :newrole_name := upper(:newrole_name); end; /

The McGraw Hill Companies, 2010

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